MIL-DTL-12285F
3.5.9 Endurance. The switch, when connected in series with a 28 volt direct current (vdc) power
source and a 3 candle power (cp) 24v lamp, shall withstand the cyclic thermal exposures specified below
a. 2500 cycles of alternating immersion in circulating oil baths at temperature of 11ºC (20ºF)
above and below the switch operating temperature at a frequency that will produce "on"
and "off" cycling.
b. 25,000 cycles of alternating immersion in circulating oil baths at temperatures 38ºC
(100.4ºF) and -12ºC (10ºF) below the switch operating temperature at a frequency of one
cycle every four minutes.
3.6 Marking. Each switch shall be marked, in accordance with MIL-STD-130, with the manufacturer's
name trade-mark or Federal manufacturer's code, the operating temperature limits, and the Army part
number (see 4.7.2).
3.7 Workmanship. Workmanship shall be such as to assure a finished product free of burrs,
scratches, rust, and sharp edges (see 4.7.1).
4. VERIFICATION
4.1 Classification of inspection. The inspection requirements specified herein are classified as
follows:
a. Qualification inspection (see 4.5).
b. Conformance inspection (see 4.6).
c. Periodic inspection (see 4.6.2).
4.2 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities
of sufficient accuracy, quality, and quantity to permit performance of the required inspection shall be
established and maintained by the supplier. The establishment and maintenance of a calibration system
to control the accuracy of the measuring and test equipment shall be in accordance with NCSL-Z540.3,
ISO10012-1, or equivalent system as approved by the qualifying activity.
4.3 Testing apparatus. Testing apparatus shall include a mounting manifold, a 3 candlepower (cp),
24-volt indicating lamp, connected to a 28-volt direct current (dc) source of electrical energy; laboratory
thermometers; pressure gages; and temperature sensors with pressure interlock. Separate temperature
controls and heating or cooling apparatus shall be provided for the mounting manifold and bath.
4.4 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in
accordance with the test conditions specified in the general requirements of MIL-STD-202.
4.5 Qualification inspection (category I switches, see 3.1, and 3.3). Qualification inspection shall be
performed at a laboratory acceptable to the Government (see 6.3), on sample units produced with
equipment and procedures normally used in production.
4.5.1 Sample. For qualification inspection, the sample size shall be as specified in table I and the
appendix to this specification. The sample units which have been subjected to qualification inspection
shall be forwarded to the preparing activity.
4.5.2 Failures. Failure of any switch to comply with the applicable requirements shall be cause for
refusal to grant qualification.
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